US5814169A - Pneumatic tire including sipes - Google Patents

Pneumatic tire including sipes Download PDF

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Publication number
US5814169A
US5814169A US08/643,532 US64353296A US5814169A US 5814169 A US5814169 A US 5814169A US 64353296 A US64353296 A US 64353296A US 5814169 A US5814169 A US 5814169A
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United States
Prior art keywords
lateral
block
sipe
groove
blocks
Prior art date
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Expired - Lifetime
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US08/643,532
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English (en)
Inventor
Yuji Yamaguchi
Chishiro Tanabe
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Bridgestone Corp
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Bridgestone Corp
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Priority to US08/643,532 priority Critical patent/US5814169A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/032—Patterns comprising isolated recesses
    • B60C11/0323—Patterns comprising isolated recesses tread comprising channels under the tread surface, e.g. for draining water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1259—Depth of the sipe
    • B60C11/1263—Depth of the sipe different within the same sipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1369—Tie bars for linking block elements and bridging the groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1259—Depth of the sipe
    • B60C2011/1268—Depth of the sipe being different from sipe to sipe
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S152/00—Resilient tires and wheels
    • Y10S152/03—Slits in threads

Definitions

  • This invention relates to pneumatic tires, particularly tires for ice-snow road surfaces, having a tread provided with blocks separated by circumferential grooves extending around the tread and lateral grooves crossing the circumferential grooves and having plural lateral sipes in the blocks.
  • treads to obtain studless tires having good performance. It is effective for enhancing performance on ice road surfaces to increase edge components by forming a block pattern on the tread and arranging sipes in the blocks.
  • both-end opening sipes extending in the lateral direction and opening to two circumferential grooves
  • edge components are increased
  • the rigidity of the whole block is decreased because the block is divided into several parts by the both-end opening sipes.
  • sufficient performance on ice road surfaces cannot be obtained.
  • arranging a both-end opening sipe adjacent to a lateral groove lowers the rigidity of a block portion substantially separated by this both-end opening sipe.
  • the block may chip easily in the case of heavy duty tires because its deformation during driving and braking becomes large, and in case of passenger tires steering stability may be degraded because net contacting area is decreased by inclination of the block and steering stability on a dry road surface may also be degraded. Therefore it was necessary to obtain means for enhancing the performance on ice road surfaces to retain the block rigidity even while increasing the density of sipes.
  • a lateral sipe adjacent to a lateral groove is made (a) to be a one-end opening sipe opening to only one circumferential groove and being closed in the block, or (b) to be a both-end opening sipe with its depth at one end shallower than that at the other end, similarly to a pneumatic tire described in Japanese Patent Laid Open No. 2-200503.
  • the rigidity of a portion where the one-end opening sipe adjacent to the lateral groove opens to the circumferential groove is lower than that of the other portion because the block is substantially divided by the one-end opening sipe; and in the latter case (b), the rigidity of a portion where the sipe depth is deeper is lower than that of the other portion, and accordingly these portions having lower rigidity deform as much as a portion separated by a conventional both-end opening sipe having constant sipe depth. Therefore, in these cases also, sufficient rigidity in the portion having large deformation could not be obtained and the above mentioned problems were not overcome.
  • This invention relates to pneumatic tires provided with plural lateral sipes in the blocks and has objects of enhancing edge effect by increasing sipe density, restraining lowering of the block rigidity caused by increasing sipe density, restraining block chipping in heavy duty tires and degrading of steering stability in passenger tires, and enhancing the performance on ice road surfaces without degrading wet performance, by means of desirably arranging a lateral sipe adjacent to a lateral groove, which brings about lowered rigidity in the block, and reinforcing the block portion having rigidity lowered by forming this lateral sipe.
  • the present invention provides a pneumatic tire having a tread provided with blocks separated by circumferential grooves extending around the tread and lateral grooves crossing the circumferential grooves, the blocks being provided with plural lateral sipes, characterized by a reinforcing means to redress difference of the rigidity between both lateral end portions of a block portion which is substantially separated by a lateral sipe adjacent to a lateral groove among the lateral sipes.
  • the lateral sipe adjacent to the lateral grooves is a one-end opening sipe with one end opening to a circumferential groove or a lateral groove and with the other end substantially being closed in the block, or that the lateral sipe adjacent to the lateral groove is a both-end opening sipe with its both ends opening to circumferential grooves or lateral grooves and with its sipe depth at one end shallower than that at the other end.
  • a platform is arranged at a lateral groove portion facing one lateral end portion having smaller rigidity in the block portion; that the angle of a groove wall portion of the lateral groove facing the block portion with respect to a contacting surface of the block is made larger at one lateral end portion having smaller rigidity in the block portion than at the other lateral end portion; that the angle of a groove wall portion of the circumferential groove facing the block portion with respect to a contacting surface of the block is made larger at one lateral end portion having smaller rigidity in the block portion than at the other lateral end portion; or that a groove wall portion of the lateral groove facing a lateral end portion having smaller rigidity in the block portion is protruded from the other groove wall portion.
  • the circumferential grooves are parallel with the equatorial plane of the tire or that the lateral grooves cross the equatorial plane at right angles.
  • sipes are arranged at a relatively large angle with respect to the direction of the rotation and the reverse-rotation of the tire.
  • the block portion "substantially" separated by the lateral sipe adjacent to the lateral groove includes the case that the lateral sipe is a one-end opening sipe; in this case, the block portion is separated by an imaginary both-end opening sipe formed by extending the one-end opening sipe from the closed end to the lateral end of the block. Further when the lateral sipe is a one-end opening sipe, it is preferable that the length of the sipe is more than 50% of the imaginary both-end opening sipe.
  • FIG. 1 shows a typical tread pattern of a pneumatic tire according to this invention
  • FIG. 2(a) is an enlarged plan view of a part of the tread of the tire shown in FIG. 1;
  • FIGS. 2(b)-(f) are plan views of parts of other treads according to this invention.
  • FIGS. 3(a) and (b) are plan views of parts of other treads according to this invention.
  • FIG. 4(a) is a plan view of a part of another tread according to this invention.
  • FIG. 4(b) is a sectional view of a block cut along the line X--X shown in FIG. 4(a);
  • FIG. 4(c) is a sectional view of a block cut along the line Y--Y shown in FIG. 4(a);
  • FIG. 5(a) is a plan view of a part of another tread according to this invention.
  • FIG. 5(b) is a sectional view of a block cut along the line Z1--Z1 shown in FIG. 5(a);
  • FIG. 5(c) is a sectional view of a block cut along the line Z2--Z2 shown in FIG. 5(a);
  • FIG. 6 is a plan view of a part of another tread according to this invention.
  • FIG. 7(a) is a plan view showing platforms arranged at a part of a lateral groove
  • FIG. 7(b) is a plan view showing one-end opening sipes replaced by flask-shape sipes
  • FIG. 7(c) is a sectional view cut along the line A--A shown in FIG. 7(b);
  • FIG. 8(a) is a plan view of a part of another tread according to this invention, and FIG. 8(b) and FIG. 8(c) are sectional views cut along the lines A--A and B--B thereof respectively;
  • FIG. 9(a) is a plan view of a part of another tread according to this invention, and FIG. 9(b) and FIG. 9(c) are sectional views cut along the lines D--D and E--E thereof respectively;
  • FIGS. 10(a), (b) and (c) are plan views of parts of other treads according to this invention.
  • FIG. 10(d) is a sectional view cut along the line F--F in FIG. 10(b);
  • FIG. 10(e) is a sectional view cut along the line G--G in FIG. 10(c);
  • FIG. 11(a) is a plan view of a part of a tread of a comparative tire used as a comparative example 1;
  • FIG. 11(b) is a plan view of a part of a tread of a comparative tire used as a comparative example 2;
  • FIG. 12(a) is a plan view of a block provided with two both-end opening sipes having different sipe depths at both lateral end portions of the block;
  • FIGS. 12(b)-(j) are views cut along the line H--H in the depth direction showing embodiments of various shapes of the both-end opening sipes;
  • FIG. 12(k) is a view showing an embodiment cut along the line I--I of FIG. 12(a);
  • FIG. 13 shows a part of a tread pattern of an invention tire 6 used as an example 6;
  • FIG. 14 is an enlarged view of a block of the block pattern as shown in FIG. 13;
  • FIG. 15(a) is an enlarged view of a block of the block pattern of a comparative tire 3.
  • FIG. 15(b) is an enlarged view of a block of the block pattern of a comparative tire 4.
  • FIG. 1 shows a typical tread pattern according to this invention
  • FIG. 2(a) shows an enlarged view of two blocks of this tire.
  • reference numeral 1 shows a tread
  • 2 shows a circumferential groove
  • 3 shows a lateral groove
  • 4 shows a block
  • 5 shows a one-end opening sipe
  • 6 shows a platform
  • 7 shows an opening of the one-end opening sipe
  • 8 shows the equatorial plane of the tire.
  • two straight lateral sipes 5a, 5b or 5a, 5c are formed in each rectangular block 4 which is separated by four circumferential grooves 2 extending straight in parallel with the equatorial plane 8 of the tire and lateral grooves 3 crossing the equatorial plane 8 at right angles and crossing the circumferential grooves 2.
  • the lateral sipes 5a, 5b or 5a, 5c are one-end opening sipes alternately arranged, but they are not limited to this arrangement and they can be, for example, both-end opening sipes having suitable sipe shape. The shape of the both-end opening sipe will be described later.
  • a platform 6a is arranged in a portion of the lateral groove 3a facing the lateral end portions 12b, 12c.
  • the height, the length in the circumferential direction and the lateral width of this platform 6a is respectively 0.25-0.75 times as large as the depth of the lateral groove 3, 0.5-1.0 times as large as the width of the lateral groove 3, and 0.2-0.5 times as large as the width of the block 4.
  • the platform 6 is formed to connect the blocks 4a and 4b facing each other in this embodiment, while the platform can be separated by a sipe or sipes from the block 4a and/or 4b, or at least one sipe can be formed in the platform 6.
  • FIGS. 2(b)-(e) show embodiments provided with the platform 6a arranged in the lateral groove 3a at the side of the circumferential groove 2a to which the lateral sipes 5b, 5c formed in the rectangular block 4a, 4b open
  • FIG. 2(f) shows an embodiment in which two one-end opening sipes 5a, 5b and 5c, 5d adjacent to the lateral groove 3a are formed in each block 4b, 4a with each two sipes facing each other and the platform is arranged at a portion in the lateral groove 3a facing the lateral end portions 12b, 12c having smaller block rigidity.
  • FIGS. 3(a) and (b) show embodiments in which the blocks 4 are parallelogram shaped and the one-end opening sipes 5 are formed substantially in parallel with the lateral groove 3a, wherein FIG. 3(a) shows the one-end opening sipes 5 formed straight and FIG. 3(b) shows the sipes 5 wavy.
  • FIG. 4(a) shows an embodiment in which groove walls 9 of the lateral groove 3 and the one-end opening sipes 5 are made bent.
  • the block portion can be reinforced by making the depth of the opening portions of the one-end opening sipes 5 shallower than that of the other portion instead of providing the platform 6.
  • FIG. 5(a) shows an embodiment in which the angles ⁇ 1 and ⁇ 2 of the groove wall 9 of the lateral groove 3 and the one-end opening sipe 5 in the depth direction are made acute angles as shown in FIG. 5(b) and FIG. 5(c).
  • FIG. 6 shows an embodiment in which the blocks 4 have a specific shape and the one-end opening sipes 5a, 5b adjacent the lateral groove 3a are formed to open to this lateral groove 3a.
  • the platforms 6 are arranged to have a length corresponding to the whole width W of the lateral groove 3, while as shown in FIGS. 7(a) and (b) the platforms 6 can be arranged to only partially occupy the lateral groove width W.
  • a platform is arranged in a circumferential groove over the whole width or partially over the width, or in a lateral groove 3 over the whole width, there is possibility that the drainage ability is degraded.
  • the lateral end portions 12a, 12b whose block rigidity is much lowered are reinforced by making the angle ⁇ 1 obtuse, which angle is formed by the groove wall portion 9a, 9c in the lateral groove 3a facing the block portion 12a, 12b and the contacting surface 10 of the block as shown in FIG. 8; or by making the angle ⁇ 1 obtuse, which angle is formed by the groove wall portion 11a, 11c in the circumferential groove 2 facing the lateral end portions 12a, 12b and the contacting surface 10 of the block as shown in FIG. 9.
  • ⁇ 2 is 90°
  • ⁇ 2 is 90°.
  • the lateral end portions 12a, 12b whose block rigidity is much lowered can be reinforced by protruding the groove wall portions 9a, 9c in the lateral groove 3a facing the lateral end portions 12a, 12b from other groove wall portions 9b, 9d by a length L.
  • the groove wall portion 9c can be protruded from the other wall portion 9b to be close to the groove wall portion 9a and separated by a sipe as shown in FIG. 10(b); and the groove wall portions 9c and 9a can be protruded from the other portions 9b, 9d facing each other and separated by sipes as shown in FIG. 10(c).
  • the bottom of the sipe separating the groove wall portions 9c, 9a needs to be enlarged as shown in FIGS. 10(d) and (e) in order to retain drainage ability.
  • the lateral sipes 5a, 5b are one-end opening sipes.
  • the lateral sipes 5a, 5b can be both-end opening sipes as shown in FIG. 12(a).
  • This embodiment has the same function as the above mentioned one-end opening sipe by making the lateral end portions 12a, 12b of the both-end opening sipes 5a, 5b deeper than the other lateral end portions 15a, 15b, as shown in FIGS. 12(b)-(k), and providing a reinforcing means (for example a platform 6 as shown in FIG. 12(a)) for reinforcing the reduced rigidity at the lateral end portions 12a, 12b.
  • a reinforcing means for example a platform 6 as shown in FIG. 12(a)
  • the deformation of the whole and a part of the block 4 can be restrained by providing the reinforcing means to redress difference of the rigidity between both lateral end portions of a block portion which is substantially separated by a lateral sipe (specifically a one-end opening sipe or a both-end opening sipe having different depth between both ends) adjacent to the lateral groove among the lateral sipes, for example by arranging a platform 6 in a part of the lateral groove 3a facing the lateral end portions 12b, 12c having smaller rigidity in the block portion (FIG.
  • a lateral sipe specifically a one-end opening sipe or a both-end opening sipe having different depth between both ends
  • the decreasing of the block rigidity by forming the lateral sipes is outstanding when the lateral sipe is adjacent to the lateral groove, and a sipe other than the sipe adjacent to the lateral groove (when the block 4 is provided with not less than three lateral sipes) can be a conventional both-end sipe having constant depth and can be changeable because local decreasing of the block rigidity by forming this sipe is small.
  • a one-end opening sipe 5 is a flask-shaped sipe with its radially inner end formed enlarged, as shown in FIG. 7(b).
  • An invention tire 1 used as an example 1 has a block pattern as shown in FIG. 1 in the tread 1, which is provided with rectangular blocks separated by four circumferential grooves 2 extending straight in parallel with the equatorial plane 8 of the tire and lateral grooves 3 crossing the equatorial plane 8 at right angles and crossing the circumferential grooves 2.
  • FIG. 2(a) shows that two straight one-end opening sipes 5a, 5b, which open to the circumferential grooves 2a, 2b respectively and are closed in the block 4a, are formed alternately in the block 4.
  • a platform 6a is arranged in a portion of the lateral groove 3a facing lateral end portions 12b, 12c having smaller rigidity in block portions 14 which are substantially separated by the one-end opening sipes 5b, 5c.
  • the block has a length of 23 mm and a width of 30 mm
  • the circumferential groove 2 has a depth of 20 mm and a width of 10 mm
  • the lateral groove 3 has a depth except where the platform is provided of 15 mm
  • the platform 6 has a groove depth at its position of 8 mm, a length of 10 mm and a width of 7 mm the same as that of the lateral groove 3.
  • the one-end opening sipe 5 has a depth of 10 mm, a width of 0.5 mm and a length of 24 mm.
  • the invention tires 1-5 and comparative tires 1-2 are heavy duty pneumatic tires and have a tire size of 11R22.5.
  • An invention tire 2 used as an example 2 has blocks 4 as shown in FIG. 6 in the tread and the blocks 4 are separated by four circumferential grooves 2 extending straight in parallel with the equatorial plane 8 of the tire and lateral grooves 3 extending stepwise and slantwise between the circumferential grooves 2.
  • Three straight one-end opening sipes 5b, 5c, 5d are formed alternately in the block 4.
  • a platform 6a is arranged in a portion of the lateral groove 3a at the openings 7a, 7b of the one-end opening sipes 5a, 5b.
  • the platform 6a has a groove depth at its position of 8 mm, a length of 10 mm and the same width as the lateral groove 3.
  • the block 4 has a maximum length of 30 mm and a minimum length of 10 mm, and a maximum width of 30 mm and a minimum width of 15 mm.
  • the circumferential groove 2 has a depth of 20 mm and a width of 10 mm, and the lateral groove 3 has a depth except where the platform 6 is provided of 15 mm.
  • the one-end opening sipes 5 have a depth of 10 mm and a width of 0.5 mm, and one-end opening sipes 5b, 5d adjacent the lateral grooves 3a, 3b have a length of 12 mm and the other one-end opening sipe 5c has a length of 24 mm.
  • An invention tire 3 used as an example 3 has a block arrangement as shown in FIG. 8 in the tread.
  • This tire has the same structure as the tire of the example 1 except that the openings 7a, 7b of the one-end opening sipes 5a, 5b adjacent the lateral groove 3a are formed to open to different circumferential grooves 2a, 2b, the angle ⁇ 1 formed by the groove wall portions 9a, 9c of the lateral groove 3a facing the lateral end portions 12a, 12b and the contacting surface 10 of the block is 110°, the angle ⁇ 2 formed by the other groove wall portions 9b, 9d of the lateral groove 3a and the contacting surface 10 of the block is 90°, and a platform is not provided.
  • An invention tire 4 used as an example 4 has a block arrangement as shown in FIG. 9 in the tread.
  • This tire has the same structure as the tire of the example 3 except that the angle ⁇ 1 formed by the groove wall portions 11a, 11c of the circumferential grooves 2 to which the one-end opening sipes 5 open and the contacting surface 10 of the block is 110°, the angle ⁇ 2 formed by other groove wall portions 11b, 11d and the contacting surface 10 of the block is 90°, and both angles ⁇ 1, ⁇ 2 are 90°.
  • An invention tire 5 used as an example 5 has a block arrangement as shown in FIG. 10 in the tread.
  • This tire has the same structure as the tire of the example 3 except that the groove wall portions 9a, 9c of the lateral groove 3a facing the lateral end portions 12a, 12b are protruded from the other groove wall portions 9b, 9d by a length L of 2 mm, and both angles ⁇ 1, ⁇ 2 are 90°.
  • An invention tire 6 used as an example 6 has a block pattern as shown in FIG. 13 (an enlarged view of the blocks 4a, 4b of this block pattern is shown in FIG. 14) in the tread 1, which is provided with rectangular blocks separated by four circumferential grooves 2 extending straight in parallel with the equatorial plane 8 of the tire and lateral grooves 3 crossing the equatorial plane 8 at right angles, and crossing the circumferential grooves 2.
  • Two straight one-end opening sipes 5a, 5b, which open to the circumferential grooves 2a, 2b and are closed in the block 4b, are formed alternately in the block 4b.
  • a platform 6a is arranged in a portion of the lateral groove 3a facing the lateral end portions 12a, 12c having small rigidity in block portions which are substantially separated by one-end opening sipes 5c, 5a. Furthermore three both-end opening sipes having constant depth are formed in a block portion between the one-end opening sipes 5a, 5b.
  • the block 4 has a length of 20 mm and a width of 20 mm
  • the circumferential groove 2 has a depth of 10 mm and a width of 7 mm
  • the lateral groove 3 has a depth of 10 mm and a width of 5 mm
  • the platform 6 has a groove depth at its position of 5 mm, a length of 7 mm and a width of 5 mm the same as the lateral groove 3.
  • the one-end opening sipes and the both-end opening sipes have a depth of 7 mm and a width of 0.5 mm
  • the one-end opening sipes 5a, 5b have a length of 12 mm.
  • the invention tire 6 and comparative tires 3-4 are passenger pneumatic tires and have a tire size of 185/70R13.
  • Comparative tire 1 used as comparative example 1 has a conventional block pattern wherein the tread has blocks 4 as shown in FIG. 11(a), the block 4 has a both-end opening sipe 13, and this both-end opening sipe 13 has a depth of 7 mm and a width of 0.5 mm.
  • Comparative tire 2 used as comparative example 2 has the same structure as the tire used as the comparative example 1, except that the tread has blocks as shown in FIG. 11(b), and the block 4 has two straight one-end opening sipes 5a, 5b formed alternately, instead of the both-end opening sipe.
  • Comparative tire 3 used as comparative example 3 has a conventional block pattern wherein the tread has blocks 4 as shown in FIG. 15(a), the block 4 has three both-end opening sipes 13 having constant depth, and these both-end opening sipes 13 have a depth of 7 mm and a width of 0.5 mm.
  • Comparative tire 4 used as comparative example 4 has the same structure as the tire used as the comparative example 3, except that the tread has blocks as shown in FIG. 15(b), and the block 4 has four both-end opening sipes 13 having constant depth.
  • Braking performance on ice road surface and wet performance were evaluated with respect to the above mentioned test tires, classifying the tires as heavy duty tires (the invention tires 1-5 and the comparative tires 1-2) and as passenger tires (the invention tire 6 and the comparative tires 3-4) respectively.
  • block chipping was also evaluated with respect to the heavy duty tires, and steering stability on dry road surface was also evaluated with respect to the passenger tires.
  • the braking performance test on ice road surface was evaluated by mounting tires on a vehicle and measuring the reciprocal value of the braking distance between braking point and stopped point after braking from a speed of 20 km/hr.
  • the wet performance test was evaluated by feeling of a driver driving on a wet road a vehicle on which 50% worn test tires were mounted.
  • the block chipping test (which was evaluated with respect to only heavy duty tires) was evaluated by observing block chipping after 20,000 km.
  • the steering stability test on dry road surface (which was evaluated with respect to only passenger tires) was evaluated by feeling of a driver driving a vehicle on which the test tires were mounted.
  • Table 1 and Table 2 show results of these tests.
  • the values in Table 1 are on the basis that the result of the comparative tire 1 is 100, and the values in Table 2 are on the basis that the result of the comparative tire 3 is 100, wherein the larger the index value in the table, the better the result.
  • the heavy duty invention tires 1-5 are better than comparative tires 1 and 2 with respect to the braking performance on ice. With respect to the wet performance, invention tires 1-5 have the same level as comparative example 1.
  • the passenger invention tire 6 is better than comparative tires 1 and 2 with respect to the braking performance on ice. With respect to the wet performance, invention tire 6 has the same level as comparative example 1.
  • block chipping caused by driving and braking can be restrained, and in passenger tires steering stability can be retained.
  • desired drainage property can be retained by reinforcing the lateral end portion 12 locally and effectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
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US08/643,532 US5814169A (en) 1993-11-18 1996-05-06 Pneumatic tire including sipes

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US5957180A (en) * 1996-03-05 1999-09-28 The Yokohama Rubber Co., Ltd. Pneumatic tire including kerfs
USD420953S (en) * 1999-03-11 2000-02-22 The Goodyear Tire & Rubber Company Tire tread
USD421584S (en) * 1999-02-11 2000-03-14 The Goodyear & Rubber Company Tire tread
USD421942S (en) * 1999-05-28 2000-03-28 The Goodyear Tire & Rubber Company Tire tread
USD427551S (en) * 1999-08-24 2000-07-04 The Goodyear Tire & Rubber Company Tire tread
USD429479S (en) * 1999-10-12 2000-08-15 The Goodyear Tire & Rubber Company Tire tread
USD433355S (en) * 1999-10-19 2000-11-07 The Goodyear Tire & Rubber Company Tire tread
EP1090781A2 (fr) * 1999-10-06 2001-04-11 Sumitomo Rubber Industries Limited Bandage pneumatique sans crampons
US6220322B1 (en) * 1998-02-12 2001-04-24 Sumitomo Rubber Industries, Ltd. Pneumatic tire including tie bars
US6315018B1 (en) * 1997-11-19 2001-11-13 Bridgestone Corporation Pneumatic tire having sipe structured by narrow groove portion and wide groove portion
US6336485B1 (en) * 1998-03-04 2002-01-08 Bridgestone Corporation Pneumatic radial tire including blocks having different lengths
US6695024B2 (en) 2001-08-03 2004-02-24 Bridgestone/Firestone North American Tire, Llc Pneumatic tire having tapered tie bars
US20050016652A1 (en) * 2001-12-26 2005-01-27 Shizuo Iwasaki Pneumatic radial tire
US20060108040A1 (en) * 2004-11-25 2006-05-25 Tetsuji Miyazaki Pneumatic tire
US20060162832A1 (en) * 2005-01-27 2006-07-27 Bridgestone/Firestone North American Tire, Llc Tire having narrowing sipes
US7090735B2 (en) 2001-08-06 2006-08-15 Bridgestone/Firestone North American Tire, Llc Method of compensating for residual aligning torque (RAT)
US20070125467A1 (en) * 2005-12-06 2007-06-07 Michelin Recherche Et Technique S.A. Tread for heavy-vehicle tire
US20090188595A1 (en) * 2006-08-29 2009-07-30 Isamu Kishizoe Pneumatic tire
US7950426B2 (en) 2007-06-08 2011-05-31 Bridgestone Americas Tire Operations, Llc Tread blocks having reduced edge stiffness
US20120160383A1 (en) * 2010-12-22 2012-06-28 The Goodyear Tire & Rubber Cmpany Pneumatic tire
US20120273107A1 (en) * 2009-12-17 2012-11-01 Michelin Recherche Et Technique S.A. Tire having enhanced rolling performance
JP2012228920A (ja) * 2011-04-25 2012-11-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
US20130087260A1 (en) * 2011-10-07 2013-04-11 Yoshiyuki Tobino Pneumatic tire
US20130133799A1 (en) * 2011-11-28 2013-05-30 The Yorkohama Rubber Co., LTD. Pneumatic Tire
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US8689843B2 (en) 2011-12-14 2014-04-08 Bridgestone Americas Tire Operations, Llc Snow performance peaks
US20140345767A1 (en) * 2013-05-27 2014-11-27 Sumitomo Rubber Industries, Ltd. Pneumatic tire
US20150000827A1 (en) * 2011-12-16 2015-01-01 Compagnie Generale Des Etablissements Michelin Method of manufacturing a tire tread
US20150298506A1 (en) * 2012-11-30 2015-10-22 Bridgestone Corporation Pneumatic tire
US20150321518A1 (en) * 2012-11-30 2015-11-12 Bridgestone Corporation Pneumatic tire
CN106142997A (zh) * 2015-05-12 2016-11-23 住友橡胶工业株式会社 充气轮胎
US20170232800A1 (en) * 2016-02-15 2017-08-17 Sumitomo Rubber Industries, Ltd. Pneumatic Tire
US20170253090A1 (en) * 2016-03-04 2017-09-07 Sumitomo Rubber Industries, Ltd. Pneumatic tire
US20180022164A1 (en) * 2015-03-18 2018-01-25 Bridgestone Corporation Tire
US20180147893A1 (en) * 2015-07-27 2018-05-31 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US20180201071A1 (en) * 2017-01-18 2018-07-19 Sumitomo Rubber Industries, Ltd. Tire
US20180215206A1 (en) * 2015-07-27 2018-08-02 The Yokohhama Rubber Co., Ltd. Pneumatic Tire
US20180312011A1 (en) * 2017-04-27 2018-11-01 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
JP2020090140A (ja) * 2018-12-04 2020-06-11 住友ゴム工業株式会社 タイヤ
US11161375B2 (en) * 2017-06-06 2021-11-02 Sumitomo Rubber Industries, Ltd. Tire
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JP4035177B2 (ja) * 1995-12-14 2008-01-16 株式会社ブリヂストン スタッドレス空気入りタイヤ
DE19604130A1 (de) * 1996-02-06 1997-08-07 Continental Ag Fahrzeugluftreifen
JP3681850B2 (ja) * 1996-04-19 2005-08-10 株式会社ブリヂストン 空気入りタイヤ
DE19702675C2 (de) * 1997-01-25 2002-02-07 Continental Ag Profil für PKW-Luftreifen
JP2000247113A (ja) 1999-02-25 2000-09-12 Bridgestone Corp 空気入りタイヤ
DE102009026086A1 (de) 2009-07-01 2011-01-05 Continental Reifen Deutschland Gmbh Fahrzeugluftreifen
DE102011000671A1 (de) 2011-02-11 2012-08-16 Continental Reifen Deutschland Gmbh Fahrzeugluftreifen
EP2754569B1 (fr) * 2011-09-08 2016-08-03 Bridgestone Corporation Pneu
WO2014083758A1 (fr) * 2012-11-30 2014-06-05 株式会社ブリヂストン Pneumatique
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US5957180A (en) * 1996-03-05 1999-09-28 The Yokohama Rubber Co., Ltd. Pneumatic tire including kerfs
US6315018B1 (en) * 1997-11-19 2001-11-13 Bridgestone Corporation Pneumatic tire having sipe structured by narrow groove portion and wide groove portion
US6220322B1 (en) * 1998-02-12 2001-04-24 Sumitomo Rubber Industries, Ltd. Pneumatic tire including tie bars
US6336485B1 (en) * 1998-03-04 2002-01-08 Bridgestone Corporation Pneumatic radial tire including blocks having different lengths
USD421584S (en) * 1999-02-11 2000-03-14 The Goodyear & Rubber Company Tire tread
USD420953S (en) * 1999-03-11 2000-02-22 The Goodyear Tire & Rubber Company Tire tread
USD421942S (en) * 1999-05-28 2000-03-28 The Goodyear Tire & Rubber Company Tire tread
USD427551S (en) * 1999-08-24 2000-07-04 The Goodyear Tire & Rubber Company Tire tread
EP1090781A3 (fr) * 1999-10-06 2002-02-13 Sumitomo Rubber Industries Limited Bandage pneumatique sans crampons
US6554034B1 (en) 1999-10-06 2003-04-29 Sumitomo Rubber Industries, Ltd. Studless tire including rib provided with first and second sipes
EP1090781A2 (fr) * 1999-10-06 2001-04-11 Sumitomo Rubber Industries Limited Bandage pneumatique sans crampons
USD429479S (en) * 1999-10-12 2000-08-15 The Goodyear Tire & Rubber Company Tire tread
USD433355S (en) * 1999-10-19 2000-11-07 The Goodyear Tire & Rubber Company Tire tread
US6695024B2 (en) 2001-08-03 2004-02-24 Bridgestone/Firestone North American Tire, Llc Pneumatic tire having tapered tie bars
US7090735B2 (en) 2001-08-06 2006-08-15 Bridgestone/Firestone North American Tire, Llc Method of compensating for residual aligning torque (RAT)
US20050016652A1 (en) * 2001-12-26 2005-01-27 Shizuo Iwasaki Pneumatic radial tire
US7341083B2 (en) * 2001-12-26 2008-03-11 Bridgestone Corporation Pneumatic radial tire with tread having blocks provided with sipes
US20060108040A1 (en) * 2004-11-25 2006-05-25 Tetsuji Miyazaki Pneumatic tire
US7562683B2 (en) * 2004-11-25 2009-07-21 Toyo Tire & Rubber Co., Ltd. Pneumatic tire with tread having blocks and bridge portions
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US7360568B2 (en) * 2005-01-27 2008-04-22 Bridgestone Firestone North American Tire, Llc Tire having narrowing sipes
US20060162832A1 (en) * 2005-01-27 2006-07-27 Bridgestone/Firestone North American Tire, Llc Tire having narrowing sipes
US20070125467A1 (en) * 2005-12-06 2007-06-07 Michelin Recherche Et Technique S.A. Tread for heavy-vehicle tire
US7874333B2 (en) * 2005-12-06 2011-01-25 Michelin Recherche Et Technique S.A. Tread fo heavy-vehicle tire having connecting bridges
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US20090188595A1 (en) * 2006-08-29 2009-07-30 Isamu Kishizoe Pneumatic tire
US7950426B2 (en) 2007-06-08 2011-05-31 Bridgestone Americas Tire Operations, Llc Tread blocks having reduced edge stiffness
US20120273107A1 (en) * 2009-12-17 2012-11-01 Michelin Recherche Et Technique S.A. Tire having enhanced rolling performance
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Publication number Publication date
DE69415281D1 (de) 1999-01-28
NO305789B1 (no) 1999-07-26
EP0654366B1 (fr) 1998-12-16
EP0654366A1 (fr) 1995-05-24
DE69415281T2 (de) 1999-07-08
NO944366L (no) 1995-05-19
FI944892A0 (fi) 1994-10-18
FI944892A (fi) 1995-08-18
NO944366D0 (no) 1994-11-15

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